Soldering-stick.



UNlTED STATES PATENT OFF-ICE.

morn RAEBURN BENSON, or ELILSWORTH, KANSAS.

\ SQLDERING-STICK.

Specification Letters Patent.

Patented June 8, .1909.

. Application filed February 18, 1909. Serial No. 478,692.

To all whom it may concern:

Be it known that I, LLOYD RAEBURN BEN- SON, a citizen 'of the United States, residing at Ellsworth, in the county of Ellsworth and State of Kansas, have invented a new and useful Soldering-Stick, of which the following is a specification.

This invention relates to soldering fluxes.

The object of the invention is to provide i a flux, in stick form, which can be conveniently used for soldering in places where an acid flux, or dissolved dry salt flux would be useless or inconvenient. Furthermore to provide a flux of the character stated, which may be readily manufactured, without the necessity of the employment of special maclnnery for the purpose, and which Wlll retain its properties, against deterioration, for i an indefinite period.

With the above and other objects in view, as Wlll appear as the nature of the invention is better understood, the same consists in 1 the novel soldering flux, hereinafter de scribed and claimed.

In carrying the invention into effect, and in making 100 parts of the completed product, 80 parts by weight of commercial stearin are taken and placed in a granite or copper vessel and subjected to gentle heat until entirely melted, after which 6:; parts by weight of melted rosin and 13%; parts byv weight of a soldering solution are added and the mass is then violently stirred for a few hardened is ready for use.

The solution referred to is a saturated one,

free from muriatic acid, and consists of the following constituents by wei ht, namely,

point and is tested with both red and blue litmus papers and if either of the latter shows other than a neutral tint, more biborate of soda is added until the test indicates that all of 'the acid has been neutralized. The inclusion of the enhanced proportion of the biborate of soda will not detract from the reducing properties of the article, as this is of itself a fair soldering flux. The reason for the addition of so large a )roporti-on of the biborate of soda to the ot er ingredients is E that it has been found practically impossible i to drive off all of the muriatic acid and obtain a solution which will stand litmus tests, as the syrup crystallizes just as it reaches the non-acid state; but by the addition of the E biborate of soda this is prevented, and brings the solution to a neutral point much quicker. 1; The above solution is employed when it is 1 desired to secure an absolutely non-acid flux, lest a residue be left on the surface to which the latter is applied and might in time pro- I duce corrosion, and this is especially true of indoor electric wire work. For general use,

however, it has been found that'a solution coni sisting of biborate of soda 5 part, chlorid of zinc 100 arts, and muriate of ammonia one part, wil answer all requirements, and as it will be seen from this that a wide variation in the proportion of the parts of the ingredients I may be adopted, it is to be understood that.

i the invention is, not-to be limited to either 2 formula given.

' The advantages claimed for this com- 2 pound over other fluxes in stick form are that it is a stronger flux due to the presence it is free from muriatic acid, leaves the met i als brighter and cleaner than the ordinary fluxes used, causes the solder to flow more freely, and preserves the tinning of the soldering irons.

It may be a plied in use by rubbing the end of a stick irectly on the parts to be soldered, or by heatin the parts and rubbing moments to prevent separation, and is then immediately poured into molds, and when them lightly with t e stick while they are still warm enough to melt the compound.

While it will generall be referred to include the biborate of sor a in are flux, it may, under some conditions, be omitted.

The pro ortions of the different parts given are t ose that have been found thor- 3 oughly efficient; but it is to be understood that the invention is not to be limited there- 1 to, as conditions might arisewhen the percentage of each will be varied.

What is claimed is:

1. A soldering flux in solid form containing stearin, rosin, chlorid of zinc, and muriate of ammonia, combined in substantially the proportions s ecified.

2. A soldering ux in solid form composed of stearin, rosin, chlorid of zinc, muriate of ammonia and biborate of soda, combined-in substantially the roportions specified.

3. A soldering ux 1n solid form consisting i of the following ingredients by Weight: eighty of muriate of ammonia and biborate of soda,

arts of commercial stem-in, six and onealf parts of rosin, and thirteen and one-half arts of a residue of a solution consisting of iiibomte of soda three hundred parts, chlorid of zinc one hundred parts, and muriate of ammonia. one part.

In testimony that I Claim the foregoing as i 3 my own, I have hereto aifixed my signature m the presence of two witnesses.

LLQYD RAEBURN BENSON. Witnesses:

IRA E. LLOYD, J. M. VVILsoN. 

